Abstract: A waveguide filter, comprising a housing defining a passage through which electromagnetic waves can travel and a plurality of adjustable projections extending through the housing into the passage. The passage is absent any fixed protrusions. The plurality of adjustable projection s comprises a set of coupling projections, wherein each pair of adjacent coupling projections in the set of coupling projections defines there between a resonant cavity. Each coupling projection in the set of coupling projections acts as a coupling element for at least one resonant cavity and is adjustable for trimming the coupling of that at least one resonant cavity. The plurality of adjustable projections further comprises a set of tuning projections, wherein a tuning projection from the set of tuning projections is positioned between each pair of adjacent coupling projections and is adjustable for trimming a resonance frequency of an associated resonant cavity.

Abstract: A waveguide filter, comprising a housing defining a passage through which electromagnetic waves can travel and a plurality of adjustable projections extending through the housing into the passage. The passage is absent any fixed protrusions. The plurality of adjustable projection s comprises a set of coupling projections, wherein each pair of adjacent coupling projections in the set of coupling projections defines there between a resonant cavity. Each coupling projection in the set of coupling projections acts as a coupling element for at least one resonant cavity and is adjustable for trimming the coupling of that at least one resonant cavity. The plurality of adjustable projections further comprises a set of tuning projections, wherein a tuning projection from the set of tuning projections is positioned between each pair of adjacent coupling projections and is adjustable for trimming a resonance frequency of an associated resonant cavity.